Home Forums TaG 300' Acceleration info needed

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    • #41368
      Brad Christophersen

      Bit off of the usual topics for karting, but I’m working on a custom project. Bear with me as I’m not into karting. Would anyone happen to know the speed a TAG kart accelerates to in 300′? Another one, I’m sure there are lots of combinations, but what gearing would you say is “typical”? Specifically in reference to a PRD motor if it matters. Thanks in advance

    • #41401
      James McMahon

      Can you tell us more about the project?

      I don’t haveĀ specific performance figures for a 300ft, but I can point you to some tools you can use to get in ballpark.


      Assumptions you can use:
      Frontal Area: .570 sqM
      C/D: .8

      Engine power of course you will have to fudge because you wont be putting peak power down throughout the run.

      • #41406
        Brad Christophersen

        Thanks, I’ll check out the link. I have a few buddies into karts, I primarily run sand drags (dirt) 300′ type racing. My son has been running a few different modified bikes but has outgrown them and looking to go with a 2 stroke motor. So got on the subject of kart motor, and ended up with a spare PRD 125. The beauty of it is being centrifugal clutch, all the racing is sportsman tree, based on your dial in time, its gas and go. So, building a complete bike around the motor. From what I’ve researched the PRD puts out about 18hp (correct me if I’m mistaken) and will basically double what we’ve been running. He has been running 7.6 second et’s at about 30-34 mph. New chassis will weight close to same, most likely lighter as the motor is significantly lighter than the 125 4 stroke pitbike motor previously ran. What I will really need to figure out is gearing, combined with tire selection in relation to mph and where the power of the PRD comes on strong. First goal is to get it all together, make some runs, then potentially look at motor work/performance upgrades. Any suggestions/info is welcome. Should be interesting

    • #41899
      Glen Mullins

      Keep in mind that the clutch can easily be destroyed from standing starts. Unless you’re capable of designing and building your own clutch you might want to consider something else.

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